Summary

Chapter 15: Advanced Networks 25Table 15-3ipconfig Command Switchesipconfig Command Switch/all/release/renew/flushdns/registerdns/displaydnsDescriptionDisplays the full configuration of all network adaptersReleases the IP address of a network adapterRenews the IP address of a network adapterEmpties the cache that stores DNS informationRefreshes DHCP leases and reregisters the adapterwith DNSShows DNS information in the cacheUsing the ping Command to Test Connectivity Between DevicesThe ping command is a CLI tool used to test connectivity between devices. You can testyour own connection by pinging your computer. To test your computer, ping your NIC.Choose Start > Run and enter cmd. At the command prompt, enter ping localhost. Thiscommand tells you if your adapter is working properly.Ping your default gateway to check if your WAN connection is working properly. You canfind the address for the default gateway by using the ipconfig command.To test the Internet connection and DNS, ping a popular website. Choose Start > Run andenter cmd. At the command prompt, enter ping destination name.The response of the ping command displays the domain’s IP address resolution. Theresponse shows replies from the ping or shows that the request timed out because a problemoccurred.Using the tracert Command to Trace PacketsThe tracert command is a CLI tool that traces the route that packets take from your computerto a destination address. Choose Start > Run and enter cmd. At the command prompt,enter tracert.The first listing in the window for the tracert result is the default gateway. Each listing afterthat is the router that packets are traveling through to reach the destination. Tracert showsyou where packets are stopping, indicating where the problem is occurring. If listings showproblems after the default gateway, this might mean that the problems are with the ISP, theInternet, or the destination server.